Radius gauge



March 7, 1950 G. R. WALLACE RADIUS GAUGE Filed 001:. 29, 1945 l 2INVENTOR.

. Georye/E Na/fiice 'QQZYLMW Patented Mar. 7, 1950 2,499,434 RADIUSGAUGE George R. Wallace, Lakewood, N. J. Application October 29, 1945,Serial No. 625,415

(Granted under the act of March 3, 1883, as amended April 30, 1928; 3700. G. 757) 8 Claims.

This invention relates to a lathe radius gauge for setting tool bits.

The object of this invention is to provide a gauge or guide that willinsure rapid setting of a cutting tool for cutting concave or convexspherical surfaces.

Further objects and advantages of this invention, as well as itsconstruction, arrangement and operation, will be apparent from thefollowing description and claims in connection with the accompanyingdrawing, in which Fig. 1 is a top plan view of a radius gauge shown inconjunction with a tool for cutting a concave spherical surface;

Fig. 2 is a front elevation of the gauge corresponding to Fig. 1; and

Fig. 3 is a top plan view of the radius gauge shown in conjunction witha tool for cutting a convex spherical surface.

A cylindrical arbor ID has a center line H, which is coaxial with thelathe tailstock when the device is in use. Integral with the cylindricalarbor I is a vertical extension I2, which in turn has integrallytherewith a horizontal extension l3, the center line l4 of thehorizontal extension I3 being in the same vertical plane as the centerline H. For setting the cutting tool, a transparent disc [5 is provided,disc l5 being attached to the horizontal extension l3 by means of ascrew 5 received threadedly by the horizontal extension [3 and carryinga sleeve spacer l6.

Inscribed on the disc 15 are two diameters l1 and IS, the diameter l8being in the same vertical plane as the center line I I. It will benoted. too, that for correct operation the underside of disc I5 islocated in the same horizontal plane as the center line H.

In the operation of the device, the center line oi the arbor l0, wheninserted in the tailstock of the lathe, is coaxial with the lathecenters. With the disc located as described above, its center is locatedon the center line of the lathe centers, with its underside in the samehorizontal plane as the lathe centers. A cutting tool 20 for cutting aconcave spherical surface is then set with its tip 2| on the diameter l8and its curved, cutting edge 22 in registry with the circumference ofthe disc [5. In this connection, it may be noted that the cutting edge22 slopes away from the tip 2| as at 23 to provide sufiicient clearanceduring the 'cutting operation. With the tool 20 thus set, it is movedinto contact with the work and the convex spherical surface turned.

Fig. 3 shows the use of the disc in conjunction with a cutting tool 30for cutting a convex spherical surface. In this case the tip 3| isplaced on the diameter l8 and the cutting edge 32 brought into registrywith the circumference of the disc l5. The tool 30 is then moved intocontact with the work and the convex spherical surface turned. It willbe noted that the cutting edge 32 is inclined in a direction away fromthe work as at 33 to provide clearance.

It is to be understood in both operations described above that theradius of the disc I5 is the same as the radius of the spherical surfaceto be turned and that the arcuate length of either of the cutting tools20 and 30 is the same as the arcuate length of the work. As illustrated,the cutting tools 20 and 30 have arcuate lengths equal to the arcuatelength of a portion of the periphery of disc l5 lying between theadjacent ends of the two diametral lines I1 and I8. In this connectiondiameter I! in Fig. 3 is used to indicate the proper setting for theinner ends of cutting edge 32.

Various modifications and changes can be made in the subject devicewithout departing from the scope of the invention.

The invention described herein may be manufactured and used by or forthe Government of the United States of America for governmental purposeswithout the payment of any royalties thereon or therefor.

I claim:

1. A radius gauge for use with a lathe comprising a cylindrical arborfor insertion into the tailstock of the lathe, said arbor having alongitudinal center line, a vertical extension integral with said arbor,a hor zontal extension having a center line, the center line of saidhorizontal extension being in the same vertical plane as the center lineof said arbor, said horizontal extension being integral with saidvertical extension, a sleeve spacer attached to said horizontalextension on the underside thereof, a transparent disc attached to saidsleeve, said disc having two diameters inscribed thereon, said diametersbeing at right angles, one of said diameters being in the same verticalplane as the center line of said arbor, said sleeve and extensions beingso constructed and arranged as to place the center of said disc on thecenter line of said arbor, and the underside of said disc in the samehorizontal plane as the center line of said arbor, whereby when thecenter line of said arbor is coaxial with the lathe centers, thediameters and circumference of the disc may be used for setting acutting tool ground on a radius the same as the radius of the disc.

2. A radius gage comprising an arbor, an 01T- set extension thereon, anda disc having a plurality of inscribed diameters, said disc beingmounted on said extension, the central axis of said disc and a facethereof intersecting the longitudinal center line of said arbor.

3. A radius gage comprising an arbor, an offset extension thereon, and atransparent disc having a plurality of inscribed diameters, said discbeing mounted on said extension, the central axis of said disc and aface thereof intersecting the longitudinal center line of said arbor.

4. A radius gage comprising an arbor, an offset extension thereon, asleeve spacer mounted on said extension normal to said arbor, and .atransparent disc having a plurality of inscribed diameters, said discbeing mounted on the end of said spacer distal said extension, thecentral axis of said disc and a face thereof intersecting thelongitudinal center line of said arbor.

5. A radius gage comprising an arbor, an oifsetextension thereon, asleeve spacer mounted on said extension normal to said arbor, and atransparent disc having a plurality of inscribed diameters, one of saiddiameters being in the same vertical plane as the longitudinal centerline of said arbor and another of said diameters being normal thereto,said disc being mounted on the end of said spacer distal said extension,the central axis of said disc and a face thereof intersecting thelongitudinal center line of said arbor.

6. A radius gage comprising an arbor, an offset extension thereon, asleeve spacer mounted same vertical plane as the longitudinal centerline of said arbor and another of said diameters being normal thereto,said disc being mounted on the 4 end of said spacer distal saidextension, the central axis of said disc and the face thereof distalsaid extension intersecting the longitudinal center line of said arbor.

7. A gage comprising an arbor, an offset extension thereon, and a platemounted on said extension and having a periphery adapted to be disposedin registry with .the cutting edge of a cutting tool, a face of said:plate and a predetermined axis of said plate intersecting said faceboth intersecting the longitudinal center line of said arbor.

8. A gage comprising an arbor, an oifset extension thereon, and a platemounted on said extension and having a periphery adapted to be disposedin registry with the cutting edge of a cutting tool, a face of saidplate and a predetermined axis of said plate intersecting said face bothintersecting thelongitudinal center line of said arbor, and means onsaid plate to indicate registry of said tool with saidpla'te.

GEORGE R. WALLACE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 135,185 Way "Jan. 21, 1873624,535 Powel May 8, 1899 888,826 Kooken May 26, 1908 1,493,813 HeuserMay 13, 1924 FOREIGN PATENTS Number Country Date 345,112 Great BritainMar. 19, 1931

